"I agree with you on the visual inspection and IR analysis. But every once in a while a customer asks what is the R rating of my Ceiling/Walls now. I perform rudimentary calculations and tell them what I can. But I really don't know what's…"

"Yes and no!
There is one instrument that sticks a couple of thermocouples against a surface and then calculates an r-value and then there are the surface temperature graph which yield another r-value number. I use a graph when necessary, but…"

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